#3998EB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.3% 0.152 248.8), rgb(57, 152, 235).
Aa
Black text reads best on this color (6.86:1).
About this color
#3998EB is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.152 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.014 away. Black text reads best on it, at 6.86:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #3998EB |
| RGB | rgb(57, 152, 235) |
| HSL | hsl(208, 82%, 57%) |
| OKLCH | oklch(66.3% 0.152 248.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3998EB | 3.05:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #3998EB | 6.86:1 | AA | Lc 47.0 | Large or bold text, headings |
| #3998EB text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #3998EB text on black | 6.86:1 | AA | Lc -44.7 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9CC5EF
oklch(80.9% 0.074 249.4)
-
Step 400
400
#62A6E7
oklch(70.7% 0.118 248.8)
-
Step 500
500 (this color)
#3998EB
oklch(66.3% 0.152 248.8)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#064473
oklch(37.8% 0.098 248.4)
-
Step 950
950
#082843
oklch(27% 0.062 248.2)
#3998EB with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #719CEE | 0.052 |
| Deuteranopia (no green cones) | #578CE9 | 0.036 |
| Tritanopia (no blue cones) | #00ACB6 | 0.112 |
| Achromatopsia (no color) | #939393 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3998EB
#3998EB
oklch(66.3% 0.152 248.8)
- #CB8000
#CB8000
oklch(66.3% 0.144 69.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3998EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.014
- Dark Sky Blue #448EE4 ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.035
- Dodger Blue #1E90FF ΔE 0.042
- Soft Blue #6488EA ΔE 0.051
- Water Blue #0E87CC ΔE 0.067
- Faded Blue #658CBB ΔE 0.076
- Cool Blue #4984B8 ΔE 0.084
Use #3998EB in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.